• Fill the silicone mold with filtered or distilled water. Aim to reach just below the brim, leaving a little space for the water to expand when freezing. Overfilling can cause the mold to crack.
• Place the filled mold on a level surface in your freezer. The sphere should freeze long enough until the outside wall is 1/4 inch thick but the inside is still liquid. This should take between 3-5 hours. We recommend testing with 4 hours first.
• Flip the ice sphere molds upside down halfway through the freezing process. So at 2 hours if you’re freezing for a total of 4 molds. And try not to open the freezer any other time.
• Once you have a 1/4 inch thick shell of ice and liquid in the center, drill a small hole through the top with a thin drill tip.
• Through the hole, use your syringe to suck up all the unfrozen water from inside the ice sphere.
• Remove the hollow ice sphere from the mold. If it isn’t budging, run the mold under COLD water for 30 seconds. Hot water will cause the sphere to crack.
• Carefully transfer the ice sphere into a sturdy glass by holding the glass sideways and sliding in the ball with your hands. Store the glass/ball in the freezer until you’re ready to fill it.

Filling and serving the ice sphere:

• Slowly fill your hollow ice sphere with your ice-cold cocktail using the syringe.
• Arm your guests with some spoons. And instruct them to crack their sphere open.